拷贝的一些生成式

a = "abc"
b = a[:]
print(a,b)#值相同
print(id(a),id(b))#地址相同(字符串是不可变类型)
d = dict(name = "Xiaoming",age = 22)
d_copy = d.copy()
print( d ,id(d))
print(d_copy ,id(d_copy))#地址不同(字典是可变类型)
q = list(range(10))
q_copy = list(q)
print( q ,id(q))#值相同，地址不同 (<class ‘range‘>)为可变类型
print(q_copy,id(q_copy))
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abc abc
2233026983024 2233026983024
{‘name‘: ‘Xiaoming‘, ‘age‘: 22} 2233146632896
{‘name‘: ‘Xiaoming‘, ‘age‘: 22} 2233027001984
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 2233146658048
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 2233164085888

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